blocks|key|1268212|text|您有相互的顶级导入，这几乎总是一个坏主意。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1268213|如果您确实需要在Python中使用相互导入，方法是在一个函数中导入它们：|1268214|#+In+b.py:
def+cause_a_to_do_something():
++++import+a
++++a.do_something()|code-block|syntax|javascript|1268215|现在，a.py可以安全地执行import+b，而不会造成问题。|offset|length|style|CODE|1268216|(乍一看，cause_a_to_do_something()的效率可能非常低，因为您每次调用它时它都会执行一个import，但实际上，导入工作只在第一次完成。第二次或以后导入模块时，这是一个快速操作。)|1268217|entityMap^0|0|0|0|E|8|0|5|P|1J|6|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|V|8|@$K|W|L|X|M|N]]|9|@]|A|$]]|$1|O|3|P|5|6|7|Y|8|@$K|Z|L|10|M|N]|$K|11|L|12|M|N]]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|13|8|@]|9|@]|A|$]]]|R|$]]

You have mutual top-level imports, which is almost always a bad idea.

If you really must have mutual imports in Python, the way to do it is to import them within a function:

<pre><code># In b.py:
def cause_a_to_do_something():
 import a
 a.do_something()
</code></pre>

Now a.py can safely do <code>import b</code> without causing problems.

(At first glance it might appear that <code>cause_a_to_do_something()</code> would be hugely inefficient because it does an <code>import</code> every time you call it, but in fact the import work only gets done the first time. The second and subsequent times you import a module, it's a quick operation.)

blocks|key|1268257|text|当我无意中命名了一个与标准Python模块同名的模块时，我也看到了这个错误。例如，我有一个名为commands的模块，它也是一个Python库模块。事实证明，这很难追踪，因为它在我的本地开发环境中工作正常，但在Google+App+Engine上运行时出现指定的错误。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1268258|entityMap^0|1B|8|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

I have also seen this error when inadvertently naming a module with the same name as one of the standard Python modules. E.g. I had a module called <code>commands</code> which is also a Python library module. This proved to be difficult to track down as it worked correctly on my local development environment but failed with the specified error when running on Google App Engine.

blocks|key|1268153|text|问题在于模块之间的循环依赖。a导入b，b导入a。但是需要先加载其中的一个-在本例中，python在b之前初始化模块a，而当您尝试在a中访问它时，b.hi()还不存在。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1268154|entityMap^0|E|1|H|1|J|1|M|1|1D|1|1L|1|1T|1|20|6|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]|$9|Q|A|R|B|C]|$9|S|A|T|B|C]|$9|U|A|V|B|C]|$9|W|A|X|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|G|$]]

The problem is the circular dependency between the modules. <code>a</code> imports <code>b</code> and <code>b</code> imports <code>a</code>. But one of them needs to be loaded first - in this case python ends up initializing module <code>a</code> before <code>b</code> and <code>b.hi()</code> doesn't exist yet when you try to access it in <code>a</code>.

blocks|key|1268281|text|我得到这个错误是因为引用了一个以错误方式导入的枚举，例如：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1268282|from+package+import+MyEnumClass
#+...
#+in+some+method:
return+MyEnumClass.Member|code-block|syntax|javascript|1268283|正确导入：|1268284|from+package.MyEnumClass+import+MyEnumClass|1268285|希望这能帮助到某些人|1268286|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I got this error by referencing an enum which was imported in a wrong way, e.g.:

<pre><code>from package import MyEnumClass
# ...
# in some method:
return MyEnumClass.Member
</code></pre>

Correct import:

<pre><code>from package.MyEnumClass import MyEnumClass
</code></pre>

Hope that helps someone

blocks|key|1268509|text|我也面临着同样的问题。已使用reload修复。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1268510|import+the_module_name
from+importlib+import+reload
reload(the_module_name)|code-block|syntax|javascript|1268511|entityMap^0|E|6|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

I faced the same issue.
fixed by using <code>reload</code>.

<pre><code>import the_module_name
from importlib import reload
reload(the_module_name)
</code></pre>

blocks|key|1482926|text|当我从git上签出一个旧版本的存储库时，我遇到了这个问题。Git替换了我的.py文件，但留下了未被跟踪的.pyc文件。由于.py文件和.pyc文件不同步，.py文件中的import命令无法在.pyc文件中找到相应的模块。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1482927|解决方案只是删除.pyc文件，并让它们自动重新生成。|1482928|entityMap^0|11|3|1G|4|1P|3|1V|4|25|3|2C|6|2N|4|0|8|4|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]|$9|Q|A|R|B|C]|$9|S|A|T|B|C]|$9|U|A|V|B|C]|$9|W|A|X|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|11|8|@]|D|@]|E|$]]]|I|$]]

I ran into this problem when I checked out an older version of a repository from git. Git replaced my <code>.py</code> files, but left the untracked <code>.pyc</code> files. Since the <code>.py</code> files and <code>.pyc</code> files were out of sync, the <code>import</code> command in a <code>.py</code> file could not find the corresponding module in the <code>.pyc</code> files.

The solution was simply to delete the <code>.pyc</code> files, and let them be automatically regenerated.

blocks|key|1268317|text|上面所有的答案都很棒，但我想在这里插话。如果您没有发现上面提到的任何问题，请尝试清理您的工作环境。这对我很管用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1268318|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

All the above answers are great, but I'd like to chime in here. If you did not spot any issue mentioned above, try clear up your working environment. It worked for me.

blocks|key|1268478|text|循环导入会带来问题，但是Python内置了一些方法来缓解它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1268479|问题是，当您运行python+a.py时，它会运行a.py，但没有将其标记为导入的模块。因此，反过来，Python模块b，a.py导入模块a，->导入模块b。最后一次导入a-+no-op，因为b当前正在被导入，a.py会防止这种情况发生。而b现在是一个空模块。因此，当它执行b.hi()时，它找不到任何东西。|offset|length|style|CODE|1268480|请注意，执行的b.hi()是在a.py+->模块b+->模块a期间执行的，而不是直接在a.py中执行。|1268481|在您的特定示例中，您可以只在顶层运行python+-c+'import+a'，因此a.py的第一次执行被注册为导入模块。|1268482|entityMap^0|0|8|B|P|4|1P|4|2X|4|3T|6|0|7|6|F|4|17|4|0|I|K|15|4|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@$D|P|E|Q|F|G]|$D|R|E|S|F|G]|$D|T|E|U|F|G]|$D|V|E|W|F|G]|$D|X|E|Y|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|Z|8|@$D|10|E|11|F|G]|$D|12|E|13|F|G]|$D|14|E|15|F|G]]|9|@]|A|$]]|$1|J|3|K|5|6|7|16|8|@$D|17|E|18|F|G]|$D|19|E|1A|F|G]]|9|@]|A|$]]|$1|L|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|M|$]]

Circular imports cause problems, but Python has ways to mitigate it built-in.

The problem is when you run <code>python a.py</code>, it runs <code>a.py</code> but not mark it imported as a module. So in turn <code>a.py</code> -> imports module b -> imports module a -> imports module b. The last import a no-op since b is currently being imported and Python guards against that. And b is an empty module for now. So when it executes <code>b.hi()</code>, it can't find anything.

Note that the <code>b.hi()</code> that got executed is during <code>a.py</code> -> module b -> module a, not in <code>a.py</code> directly.

In your specific example, you can just run <code>python -c 'import a'</code> at top-level, so the first execution of <code>a.py</code> is registered as importing a module.

blocks|key|1268658|text|对我来说，这个错误的原因是有一个与我试图导入的python模块同名的文件夹。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1268659|%7C--+core++<--+empty+directory+on+the+same+level+as+the+module+that+throws+the+error
%7C--+core.py|code-block|syntax|javascript|1268660|python将该文件夹视为python包，并尝试从该空包“核心”导入，而不是从core.py导入。|1268661|似乎出于某种原因，git在分支切换过程中留下了空文件夹|1268662|所以我移走了那个文件夹，一切都很顺利|1268663|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

For me, the reason for this error was that there was a folder with the same name as the python module I was trying to import.
<pre><code>|-- core &lt;-- empty directory on the same level as the module that throws the error
|-- core.py
</code></pre>
And python treated that folder as a python package and tried to import from that empty package &quot;core&quot;, not from core.py.
Seems like for some reason git left that empty folder during the branches switch
So I just removed that folder and everything worked like a charm

blocks|key|1268713|text|你可以通过添加两张照片来了解正在发生的事情：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1268714|a.py：|1268715|print(__name__)
import+b|code-block|syntax|javascript|1268716|b.py：|1268717|print(__name__)
import+a|1268718|然后：|1268719|$+python3+a.py
__main__
b
a|1268720|因此，a.py最终被加载/执行了2次。一个作为__main__，另一个作为a。|offset|length|style|CODE|1268721|entityMap^0|0|0|0|0|0|0|0|3|4|N|8|11|1|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|10|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|11|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|12|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|13|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|14|8|@]|9|@]|A|$G|H]]|$1|Q|3|R|5|6|7|15|8|@$S|16|T|17|U|V]|$S|18|T|19|U|V]|$S|1A|T|1B|U|V]]|9|@]|A|$]]|$1|W|3|-4|5|6|7|1C|8|@]|9|@]|A|$]]]|X|$]]

You can understand what's going by adding 2 prints :
a.py :
<pre class="lang-py prettyprint-override"><code>print(__name__)
import b
</code></pre>
b.py :
<pre class="lang-py prettyprint-override"><code>print(__name__)
import a
</code></pre>
Then:
<pre class="lang-sh prettyprint-override"><code>$ python3 a.py
__main__
b
a
</code></pre>
so <code>a.py</code> ends up being loaded/executed 2 times. one as <code>__main__</code> and one as <code>a</code>.

blocks|key|1483273|text|在某些情况下，可以简单地将文件保存在正确的目录中，但是当在虚拟环境中写入文件时，文件上编写的python尚未保存。因此，当python将a.py导入到b.py时，并没有导入任何代码。换句话说，它是空白的。这似乎是我经常看到的一个很容易识别的错误。这是值得检查的。-Cody|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1483274|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

In some cases it could be simply that the file is saved in the right directory but the python written on the file is not yet saved when writing it on the virtual environment. So when python imports a.py to b.py there is no code imported. It's blank in other terms. Seems like a easy to identify error that I see often. It's worth checking.
-Cody

blocks|key|1268410|text|不确定是如何解决我的问题的，但下面的更改解决了我的问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1268411|我有相同的文件名和导入名，例如我的文件名为emoji.py，我正在尝试导入表情符号。但是更改文件名就解决了这个问题。|1268412|希望能有所帮助|1268413|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

Not sure how but the below change sorted my issue:

i was having the name of file and import name same for eg i had file name as emoji.py and i was trying to import emoji. But changing the name of file solved the issue .

Hope so it helps

blocks|key|1483061|text|我已经讨论过这个问题很多次了，但我并没有试图深入挖掘它。现在我明白了主要的问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1483062|这一次我的问题是从不同的模块导入序列化程序(+django和restframework+)，如下所示：|1483063|from+rest_framework+import+serializers

from+common+import+serializers+as+srlz
from+prices+import+models+as+mdlpri

#+the+line+below+was+the+problem+'srlzprod'
from+products+import+serializers+as+srlzprod|code-block|syntax|javascript|1483064|我遇到了这样的问题：|1483065|from+product+import+serializers+as+srlzprod
ModuleNotFoundError:+No+module+named+'product'|1483066|我想要完成的是：|1483067|class+CampaignsProductsSerializers(srlz.DynamicFieldsModelSerializer):
++++bank_name+=+serializers.CharField(trim_whitespace=True,)
++++coupon_type+=+serializers.SerializerMethodField()
++++promotion_description+=+serializers.SerializerMethodField()

++++#+the+nested+relation+of+the+line+below
++++product+=+srlzprod.ProductsSerializers(fields=['id','name',],read_only=True,)|1483068|因此，正如上面提到的如何解决它(顶级导入)，我继续进行以下更改：|1483069|#+change
product+=+srlzprod.ProductsSerializers(fields=['id','name',],read_only=True,)
#+by+
product+=+serializers.SerializerMethodField()

#+and+create+the+following+method+and+call+from+there+the+required+serializer+class
def+get_product(self,+obj):
++++++++from+products+import+serializers+as+srlzprod
++++++++p_fields+=+['id',+'name',+]
++++++++return+srlzprod.ProductsSerializers(
++++++++++++obj.product,+fields=p_fields,+many=False,
++++++++).data|1483070|因此，执行django+runserver时没有任何问题：|1483071|./project/settings/manage.py+runserver+0:8002+--settings=settings_development_mlazo
Performing+system+checks...

System+check+identified+no+issues+(0+silenced).
April+25,+2020+-+13:31:56
Django+version+2.0.7,+using+settings+'settings_development_mlazo'
Starting+development+server+at+http://0:8002/
Quit+the+server+with+CONTROL-C.|1483072|代码行的最终状态如下：|1483073|from+rest_framework+import+serializers

from+common+import+serializers+as+srlz
from+prices+import+models+as+mdlpri

class+CampaignsProductsSerializers(srlz.DynamicFieldsModelSerializer):
++++bank_name+=+serializers.CharField(trim_whitespace=True,)
++++coupon_type+=+serializers.SerializerMethodField()
++++promotion_description+=+serializers.SerializerMethodField()
++++product+=+serializers.SerializerMethodField()

++++class+Meta:
++++++++model+=+mdlpri.CampaignsProducts
++++++++fields+=+'__all__'

++++def+get_product(self,+obj):
++++++++from+products+import+serializers+as+srlzprod
++++++++p_fields+=+['id',+'name',+]
++++++++return+srlzprod.ProductsSerializers(
++++++++++++obj.product,+fields=p_fields,+many=False,
++++++++).data|1483074|希望这能对其他人有所帮助。|1483075|大家好，|1483076|entityMap^0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|18|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|19|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|1A|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|1B|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|1C|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|1D|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|1E|8|@]|9|@]|A|$G|H]]|$1|Q|3|R|5|6|7|1F|8|@]|9|@]|A|$]]|$1|S|3|T|5|F|7|1G|8|@]|9|@]|A|$G|H]]|$1|U|3|V|5|6|7|1H|8|@]|9|@]|A|$]]|$1|W|3|X|5|F|7|1I|8|@]|9|@]|A|$G|H]]|$1|Y|3|Z|5|6|7|1J|8|@]|9|@]|A|$]]|$1|10|3|11|5|F|7|1K|8|@]|9|@]|A|$G|H]]|$1|12|3|13|5|6|7|1L|8|@]|9|@]|A|$]]|$1|14|3|15|5|6|7|1M|8|@]|9|@]|A|$]]|$1|16|3|-4|5|6|7|1N|8|@]|9|@]|A|$]]]|17|$]]

I have crossed with this issue many times, but I didnt try to dig deeper about it. Now I understand the main issue.

This time my problem was importing Serializers ( django and restframework ) from different modules such as the following :

<pre><code>from rest_framework import serializers

from common import serializers as srlz
from prices import models as mdlpri

# the line below was the problem 'srlzprod'
from products import serializers as srlzprod
</code></pre>

I was getting a problem like this :

<pre><code>from product import serializers as srlzprod
ModuleNotFoundError: No module named 'product'

</code></pre>

What I wanted to accomplished was the following :

<pre><code>class CampaignsProductsSerializers(srlz.DynamicFieldsModelSerializer):
 bank_name = serializers.CharField(trim_whitespace=True,)
 coupon_type = serializers.SerializerMethodField()
 promotion_description = serializers.SerializerMethodField()

 # the nested relation of the line below
 product = srlzprod.ProductsSerializers(fields=['id','name',],read_only=True,)

</code></pre>

So, as mentioned by the lines above how to solve it ( top-level import ), I proceed to do the following changes :

<pre><code># change
product = srlzprod.ProductsSerializers(fields=['id','name',],read_only=True,)
# by 
product = serializers.SerializerMethodField()

# and create the following method and call from there the required serializer class
def get_product(self, obj):
 from products import serializers as srlzprod
 p_fields = ['id', 'name', ]
 return srlzprod.ProductsSerializers(
 obj.product, fields=p_fields, many=False,
 ).data

</code></pre>

Therefore, django runserver was executed without problems :

<pre><code>./project/settings/manage.py runserver 0:8002 --settings=settings_development_mlazo
Performing system checks...

System check identified no issues (0 silenced).
April 25, 2020 - 13:31:56
Django version 2.0.7, using settings 'settings_development_mlazo'
Starting development server at http://0:8002/
Quit the server with CONTROL-C.

</code></pre>

Final state of the code lines was the following :

<pre><code>from rest_framework import serializers

from common import serializers as srlz
from prices import models as mdlpri

class CampaignsProductsSerializers(srlz.DynamicFieldsModelSerializer):
 bank_name = serializers.CharField(trim_whitespace=True,)
 coupon_type = serializers.SerializerMethodField()
 promotion_description = serializers.SerializerMethodField()
 product = serializers.SerializerMethodField()

 class Meta:
 model = mdlpri.CampaignsProducts
 fields = '__all__'

 def get_product(self, obj):
 from products import serializers as srlzprod
 p_fields = ['id', 'name', ]
 return srlzprod.ProductsSerializers(
 obj.product, fields=p_fields, many=False,
 ).data

</code></pre>

Hope this could be helpful for everybody else.

Greetings,

blocks|key|1268589|text|在我使用带有numpy+1.15.0版本的python+2.7的情况下，它与|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1268590|pip+install+statsmodels=="0.10.0"|code-block|syntax|javascript|1268591|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

In my case working with python 2.7 with numpy version 1.15.0, it worked with
<pre><code>pip install statsmodels==&quot;0.10.0&quot;
</code></pre>

I have two python modules:

a.py

<pre><code>import b

def hello():
 print "hello"

print "a.py"
print hello()
print b.hi()
</code></pre>

b.py

<pre><code>import a

def hi():
 print "hi"
</code></pre>

When I run <code>a.py</code>, I get:

<pre><code>AttributeError: 'module' object has no attribute 'hi'
</code></pre>

What does the error mean? How do I fix it?

AttributeError: 'module' object has no attribute

Django

Python

我有两个python模块：a.pyimport bdef hello():  print "hello"print "a.py"print hello()print b.hi()b.pyimport adef hi():  print "hi"当我运行a.py时，我得到：AttributeError: 'module' object has no attribute 'hi'这个错误是什么意思？我

问模块:AttributeError对象没有特性
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